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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debabe743a51fa9dda0283c7aa4b4d28b77319be94508becea396cbca6eed473' 
  AND token = 'Ghg3kW06ztpGo0zwlfQbNk7UCi/SJUJkl32fmmmpTaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}